Drawing device for spinning mules, spinning frames, and preparatory machines



March 4, 1930. J. PF'LIMLIN 1,749,156

DRAWING DEVICE FOR SPINNING MULES, SPINNING FRAMES, AND PREPARATORY MACHINES Filqd F9!)- 15, 1927 Patented Mar. 4, 1930 UNITED, STATES PATENT OFFICE JULES PFLIM'LIN, OE MULHOUSE, FRANCE DRAWING DEVICE FOR SPINNING MULES, SPINNING FRAMES, AND PREPARATORY MACHINES Application filed February 15, 1927, Serial No. 168,480, and in France February 17, 1826.

The present invention relates to improved sliver or roving drawing devices devised for the drawing eflected by spinning mules,

- jennies, spinning frames, and the like, as also by. preparatory machines and for drawingframes.

Two requirements are to be complied with Whenever a drawing operation is to be performed: (1) the leastpossible distance should be kept. between the clasping oint of the I drawing rollers and the clasp, 2) the pressure exerted upon the sliver or roving by the v clasp of the intermediate rollers should .be

' slight so as to permit slip and drawing of the fibre at such point.

These requirements have been, to a certain extent, complied with in-the devices already known, a number of which to gain the first requirement make use of an upper clasping ,goroller of a comparatively small diameter resting upon a lower roller with a fluted surface, while others to gain the second requirement resort to the use of one or more sleeves on the order of small endless aprons. The

n; small clasping rollers are advantageous in that they are very simply devised, but they are objectionable in that their work is neither perfect nor reliable. As to the use ofendless aprons, they are fairly effective, but are rather complicated, very expensive in respect of both cost and upkeep, and, therefore, do

not provide-for economical work.

The subject-matter of this present invention provides for proper drawing by reason that the floating roller, i. e. the upper one of the two intermediateclasping rollers comprised in a series of pairs of rollers, has been equipped with a sleeve-like body having a suflicient thickness to provide a great resiliency and flexibility. As a result of the weight of said floating roller (with the addition, if ever necessary, of an extra weight) the sleeve-like body resiliently presses against the lower roller and is so deformed as to conform to the surface of the same and cover a considerable part o'fits circumferential surface in the nature of a belt grip while yet preserving the advantage of a roller grip, the oint at which it releases the sliver or roving being brought as near as possible to the clasping point of the drawing rollers. Moreover, this arrangement provides for clasping the sliver upon a comparatively great length, though requiring for proper clasping action but a slight pressure owing to the great resiliency and flexibility of the yielding body of the floating roller, whereby only a restricted portion of the total pressure is imparted to the sliver.

In the accompanying drawing there is hi the embodiment of the invention illustrated by Fig. 1, the arrangement comprises, between the feed rollersA and A and the delivery rollers B and B otherwise known as drawing rollers, the intermediate pair of rollers comprising a fluted roller C and a floater D. The distance between these intermediate rollers and the drawing rollers is as short as is practicable, and is, in any case, slightly less than the average length of the fibre 'to be spun.

The floating roller D comprises a metal core a which has been equipped with a sleeve-- like bodyb of substantial thickness and having great resiliency. In order to provide for fulfillment of so essential a. condition (great resiliency and flexibility of floater D) the sleeve 6 will be'made of some very resilient and yielding substance, such as indiarubber, pure Para rubber or spongy rubber, or of very soft felt, or the like. It has been found in practice that the required resiliency and flexibility or elastic suppleness of the floater D to enable it to deform sufliciently to obtain abelt-like grip on the lower intermediate roller C, is best secured by employing a sleeve having a cellular internal struc-" ture throughout its thickness. One example is sponge. rubber named above. In some cases,

. be modified by altering the value of thesuchsleeve will be covered with a protecting sheath of some thin and flexible skin, as indiweight a.

To limit the pressure exerted by the roller upon the sliver or roving the shaft a need only have a step-up part e of a predetermined diameter; indeed, any increase in the value of the weight 0 will result in an increase-0f the pressure'upon the sliver or roving, and

will correspondingly increase deformation of the sleeve-like body I), only until the stepmeans of the peculiar shaping of the de orm -rying-forward up part 6 comes to rest upon the lower intermediate roller 0, whereupon the pressure upon the sleeve can only increase together with an increase in the thickness of said sliver or roving.

Briefly summarized, the present. invention is characterized by the use of an upper roller D, of the intermediate pair of clasping rollers, comprising a body of readily deformable material having a cellular internal construction of substantial thickness. This body, as shown in Figs. 1 and 3 is deformed by pressure against the periphery of the hard, coacting lower intermediate roller C so as to conform to its circumferentialjsurface like a belt throughout a considerable-. arc, extending both rearward and forward of the plane in which the axes of th'e two rollers D and 0 lie. The forward extent of said are around said roller'C is to a point relatively closeto the nip of the forward air of drawing rollers. It will be perceived that the sliver or roving E, in passing between the intermediate rollers D and G' on its way from the feeding rollersA and-.A to the drawin rollers B and B is confined and controlle through amaterial art o'fits travel to "the pair of drawing ro lers, between extensive surface portions of the intermediate rollers which are continuously in contact with each other. It will further be perceived that the extended control of the sliver or rovin by able floating roller D to the contour of the lower roller C not only provides for the carof the sliver or roving throughout a considerable portion of the interval between the feeding-rollers, and the drawing rollers but, by virtue of the control thus exercised over the sliver being continued to a pointclose to the ni of the drawingrollers, the fibres of the s iver or roving are payed out evenly to the drawing-rollers and the fly or short fibres are prevented from being drawn forward in variable quantity, whereby unevenness in the drawn sliver or roving as delivered by the rollers B B is avoided, even when the sliver or roving is com osed of fibres of unequal length.

aving thus described the preferred form of my invention, what I claim asnew and desire to secure by Letters Patent is 1. An up er intermediate roller for drawing devices or machines of the class described com rising a cylindrical "core portion and a flexi le resilient cover, said cover being characterized by its considerable thickness, great resiliency and flexibility, so that by pressing on the bottom roller it embraces the latter upon a comparatively large part of its peripheral surface, the cylindrical core portion being provided on each side of the cover with a step-up part of such a diameter as to limit the pressure of the top roller upon the sliver or roving within a predetermined maxi- 1 mum, independently of the amount of pressure.

2. A cover for upper intermediate rollers of drawing devices sleeve of very soft elastic material and of considerablethickness adapted to embrace the bottom roller upon a comparatively large part of its circumferential surface, and having a protecting sheath of soft and flexible skin.

3. Drawing devices for machines of the class described having, in combination, coacting feed rollers, coacting drawing rollers,

and an upper intermediate roller having a deformable covering adapted when pressed mprising a cylindricalagainst a coacting lower intermediate membar to spread over a comparatively. large area of the latters surface, to obtain a belt-like engagement of the sliver and to extend itscontrol of the sliver a substantial distance in the direction of extent of said sliver and consetllluently toward the nip of the drawing r0, ers.

4. Drawing devices for machines of thedeformable material with substantial circumferential arcs of said thickness displaceable bodily around and conformin to the convexity of the coacting roller y pressure against the latter, with the resulting concavity produced in said body embracing the circumferential surface of said coacting roller throughout, a considerable arc, extending forward of the plane in which the axes of the said intermediate pairs of rollers lie and therefor comprisln continuing to a point relativ'el close to the of the drawmg-rollers, w ereb a con- I ed and 5. In a device of the class described for drawing slivers or rovin an upperclasping roller comprising a rigi core having mounted thereon a sleeve-like cellular body of substantial thickness and of such great resiliency as to be deformable through a substantial depth of its thickness when ressed against a coacting lower clasping r01, er thus to contact with a relatively long are of the surface of said lower roller. v

6. An up er intermediate roller for drawing frames aving a rigid core and a cover a resilient cglindrical sleeve having a wa of considera 1e thickness as compared to the diameter of said core, said wall internally being broken into a plurality of cells but externally; presenting a solid circumferential surface.

7 A floater roller for devices of the character described comprising a substantial body of resilient material characterized by .in-

ternal air cells.

. 8. In a sliver or roving drawing device, an upper intermediate roller comprising a sleeve 0 sponge rubber. 3

In testimony whereof I signed hereunto my name.

' JULES' PFLH ILIN. 

